PAC7311 VGA PC Camera Single-Chip

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Ada Jordan
5 years ago
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1 General Description The is a single chip with an embedded VGA CMOS image sensor and USB 1.1 interface. It has JPEG image compression and image processing. The generic application is a PC camera. JPEG decoder and auto exposure are performed by software in PC side. And the optical size is 1/4 which can easily be embedded in LCD monitors, notebooks or PDA. There are 4 IO-trapping pins with internal pull-low resistors. It is flexible for customers to set PID. It supports the interface to a serial-eeprom. When the EEPROM function is enabled, the internal control registers can be power-up loaded from external EEPROM. This allows customization of VID, PID, product string. Features Key Specification VGA resolution, ~1/4 Lens Supply Voltage 5.0V ± 10% Frame rate up to 30fps at following resolution format VGA format (640x480) with JPEG compression Resolution 640 (H) x 480 (V) CIF format (352x288) with JPEG compression QVGA format (320x240) with JPEG compression Array Diagonal 4.48mm QCIF format (176x144) without compression Optical format 1/4 QQVGA format (160x120) without compression RGB Bayer s pattern raw data Pixel Size 5.6um x 5.6um Up to format (640x480) Frame Rate Up to 30fps Up to format (352x288) Up to format (320x240) System Clock 12MHz Up to format (176x144) Color Filter RGB Bayer Pattern Up to format (160x120) Standard JPEG compression engine comply to ISO/IEC Scan mode Progressive (JPEG) Sensitivity 3.06 V/lux*sec AEC/AGC/AWB automatic 4 IO-trapping pins to set USB PID PGA gain 23.52dB (Max.) Support USB suspend mode S/N ratio Support video data transfer through USB isochronous >45dB transfer Power consumption 65mA Snapshot control through USB interrupt pipe Package USB Vendor ID, Product ID, device release number and 48-pin PLCC / 37-pin CSP the string descriptor index via a serial EEPROM (93C46) or by metal mask Complete Universal Serial Bus spec V1.1 compatibility Ordering Information Order number Package Type Package Size(mm) PE 48-pin PLCC x CS 37-pin CSP 5.06 x 5.55 All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 1

2 1. Pin Assignment 1.1 PLCC Package Pin# Name Type Description 1 - No Connection 2 - No Connection 3 - No Connection 4 BYPASS Analog voltage reference 5 BYPASS Analog voltage reference 6 - No Connection 7 - No Connection 8 BYPASS Analog voltage reference 9 BYPASS Analog power for AD/DA/PGA, 2.5V 10 Y BYPASS Sensor reset power reference 11 EPR_DO IN Data output of EEPROM 12 GND Ground for I/O and PHY 13 BYPASS Power for I/O and PHY 14 EPR_CS/TR2 OUT Chip Select of EEPROM; (IO trap pin for PID2, internal pull-down 100Kohm) 15 EPR_CK/TR3 OUT Serial clock of EEPROM; (IO trap pin for PID3, internal pull-down 100Kohm) 16 EPR_DI/TR1 OUT Data input of EEPROM; (IO trap pin for PID1, internal pull-down 100Kohm) 17 GND Sensor ground 18 - No Connection 19 - No Connection 20 GPO/TR0 OUT General purpose output; (IO trap pin for PID0, internal pull-down 100Kohm) 21 OUT driver 22 - No Connection 23 GND Ground for I/O and PHY 24 EPR_EN IN Enable signal of EEPROM (1: enable, 0: disable), internal pull-down 100Kohm 25 IOTRAP# IN I/O trap enable signal (0: enable, 1: disable, internal pull-down 100Kohm) 26 KEY# IN Snapshot control signal (Active Low, internal pull-up 100Kohm) 27 - No Connection 28 GND Ground for I/O and PHY 29 BYPASS Logic power for mixed-mode circuit, 2.5V 30 PWR Main power, USB bus power 31 - No Connection 32 BYPASS Power for I/O and PHY, 3.3V 33 GPIO IO General purpose input/output, internal pull-down 100Kohm 34 TEST IN Test pin. Connect to GND in normal operation mode 35 - No Connection 36 RESET# IN Chip power up reset 37 GND Ground for I/O and PHY 38 OUT Crystal output 39 IN Crystal input 40 I/O for USB1.1 PHY 41 I/O for USB1.1 PHY 42 - No Connection 43 BYPASS Power for I/O and PHY 44 VD BYPASS Analog power for PLL 45 D BYPASS Analog voltage reference power for core logic, 2.5V 46 V BYPASS Analog voltage reference 47 GND Analog ground 48 PWR Main power, USB bus power All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 2

3 1.2 CSP Package Pin# Name Type Description 1 - No Connection 2 BYPASS Analog voltage reference 3 BYPASS Analog voltage reference 4 BYPASS Analog voltage reference 5 BYPASS Analog power for AD/DA/PGA, 2.5V 6 Y BYPASS Sensor reset power reference 7 EPR_DO IN Data output of EEPROM 8 GND Ground for I/O and PHY 9 BYPASS Power for I/O and PHY 10 EPR_CS/TR2 OUT Chip Select of EEPROM; (IO trap pin for PID2, internal pull-down 100Kohm) 11 EPR_CK/TR3 OUT Serial clock of EEPROM; (IO trap pin for PID3, internal pull-down 100Kohm) 12 EPR_DI/TR1 OUT Data input of EEPROM; (IO trap pin for PID1, internal pull-down 100Kohm) 13 GND Sensor ground 14 GPI/TR0 OUT General purpose output; (IO trap pin for PID0, internal pull-down 100Kohm) 15 OUT driver 16 EPR_EN IN Enable signal of EEPROM (1: enable, 0: disable), internal pull-down 100Kohm 17 IOTRAP# IN I/O trap enable signal (0: enable, 1: disable, internal pull-down 100Kohm) 18 KEY# IN Snapshot control signal (Active Low, internal pull-up 100Kohm) 19 - No Connection 20 GND Ground for I/O and PHY 21 BYPASS Logic power for mixed-mode circuit, 2.5V 22 PWR Main power, USB bus power 23 BYPASS Power for I/O and PHY 24 GPIO IO General purpose input/output, internal pull-down 100Kohm 25 TEST IN Test pin. Connect to GND in normal operation mode 26 RESET# IN Chip power up reset 27 GND Ground for I/O and PHY 28 OUT Crystal output 29 IN Crystal input 30 I/O for USB1.1 PHY 31 I/O for USB1.1 PHY 32 BYPASS Power for I/O and PHY, 3.3V 33 VD BYPASS Analog power for PLL 34 D BYPASS Analog voltage reference power for core logic, 2.5V 35 V BYPASS Analog voltage reference 36 GND Analog ground 37 PWR Main power, USB bus power All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 3

4 2. Block Diagram is a single-chip USB camera. It includes a VGA sensor based on PixArt VGA sensor with enhanced image quality and sensitivity, a 48MHz PLL, internal regulators, JPEG image compression, image processing schemed, control registers, on-chip SRAM for image data buffer and USB controller. All register parameters are set by USB interface. And the JPEG compressed image data is transmitted by USB 1.1 isochronous pipe. All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 4

5 3. Function Description 3.1 Analog Data Path The PixArt VGA sensor is a 1/4inch CMOS imaging sensor with 644x488 physical pixels. The active region of sensor array is 644x484. The sensor array is cover with Bayer pattern color filters and micro lens. After a programmable exposure time, the image is sampled first with CDS (Correlated Double Sampling) block to improve S/N ration and reduce fixed pattern noise. Three analog gain stages are implemented before signal transferred by the 10bit ADC. The front gain stage (FG) can be programmed to fit the saturation level of sensor to the full-range input of ADC. The programmable color gain stage (CG) is used to balance the luminance response difference between B/G/R. The global gain stage (GG) is programmed to adapt the gain to the image luminance. The fine gained signal will be digitized by the on-chip 10bit ADC. After the image data has been digitized, further alteration to the signal can be applied before the data is output. The gain stage can be set by digital register, please refer to the following equation to get the mapping gain. Front Gain = 2 (n/4), n = 0, 1, 2, 7 Color Gain = 1 (m/16), m= 0, 1, 2, 15 Global Gain = 1 (q/16), q = 0, 1, 2, 15 All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 5

6 4. Specifications Absolute Maximum Ratings Exposure to absolute maximum rating may affect device reliability. Symbol Parameter Min Max Unit Notes V DD DC supply voltage V V IN DC input voltage V V OUT DC output voltage V T STG Storage temperature 0 70 Recommend Operating Condition Symbol Parameter Min Typ. Max Unit Notes T A Operating Temperature 0-40 C V DD Power supply voltage V F CLK System clock frequency MHz DC Electrical Characteristics (Typical values at 25 C, V DD =5.0 V) Symbol Parameter Min. Typ. Max. Unit Notes Type: PWR I DD Operating Current 65 frame/sec Type: IN & I/O, Reset V IH Input voltage HIGH 2.0 V DDQ V V IL Input voltage LOW V C IN Input capacitor 10 pf I LKG Input leakage current 1.0 ua Type: OUT & I/O V OH Output voltage HIGH V DDQ -0.2 V C L = 10pf, R L =1.2kΩ V OL Output voltage LOW 0.2 V C L = 10pf, R L =1.2kΩ Sensor Characteristics (Light source: 3200K halogen lamp; 8bit resolutions) Symbol Parameter Min. Typ. Max. Unit Notes PRNU Photo response non-uniformity % VSAT Saturation output voltage V VDARK Dark output voltage V/sec DSNU Dark signal non-uniformity V R Sensitivity (Red channel) V/Lux*sec G Sensitivity (Green channel) V/Lux*sec B Sensitivity (Blue channel) V/Lux*sec All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 6

7 5. Package Information 5.1 PLCC Pin Assignment and Optical Center Information Note: Sensor Array Center = Package Center --TOP VIEW All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 7

8 5.2 PLCC Package Outline Dimension TOP VIEW -- All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 8

9 5.3 CSP Pin Assignment Pad Extension Formation Leads & BGA Formation EPR_DI/TR1 EPR_CK/TR3 EPR_CS/TR2 EPR_DO Y Y EPR_DO EPR_CS/TR2 EPR_CK/TR3 EPR_DI/TR1 GPO/TR0 GPO/TR0 EPR_EN IOTRAP# Sensor Area EPR_EN IOTRAP# KEY# V D V D NNN NNN KEY# VD VD GPIO TEST RESET# Top view (Bumps down) Step Size: um Die Size: um Ball Pitch:650 um Ball Diameter:300 um Scribe Line:360 um 5.4 Recommend PCB Layout RESET# TEST GPIO Buttom view (Bumps up) Package Size: um Marking Code:NNNNNN - Datecode All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 9

10 5.4 CSP Package Dimensions and Ball Matrix Table A (PIN 13) EPR_DI/TR(PIN 12) EPR _CS/TR2(PIN 10) (PIN 8) Y(PIN 6) (PIN 4) B (PIN 15) GPO/TR0(PIN 14) (PIN 9) EPR _D0(PIN 7) (PIN 3) (PIN 2) C /EPR_EN(PIN 16) EPR _CK/TR3(PIN 11) (PIN 5) (PIN 1) (PIN 37) D IOTRAP# (PIN 17) KEY# (PIN 18) V(PIN 35) (PIN 36) E (PIN 19) (PIN 20) VD(PIN 33) D(PIN 34) F (PIN 21) (PIN 22) RESET# (PIN 26) (PIN 28) (PIN 30) (PIN 32) G (PIN 23) GPIO(PIN 24) TEST(PIN 25) (PIN 27) (PIN 29) (PIN 31) A E S1 J S2 F A B J2 A B C C B D E D E NNN NNN F F G G Center of sensor Top view (Bumps down) Center of BGA= Center of package C3 Bottom view (Bumps up) C2 C Marking Code:NNNNNN - Datecode C1 Side view Symbol Nominal Min. Max. µm Package Body Dimension X A Package Body Dimension Y B Package Height C Ball Height C Package Body Thickness C Thickness of Glass surface to wafer C Ball Diameter D Total Pin Count N 37 Pin Count X axis N1 6 Pin Count Y axis N2 7 Pins Pitch X axis J1 650 Pins Pitch Y axis J2 650 Edge to Pin Center Distance analog X S Edge to Pin Center Distance analog Y S Edge to Optical Center Distance analog X E Edge to Optical Center Distance analog Y F All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 10

11 6. Reference Application Circuit 6.1 PLCC Package (PE) Y R2 R1 10k 1K D1 R3 51k C1 RST# KEY GPO/TR0 EPR_EN IOTRAP# KEY# EPR_DI/TR1 EPR_CK/TR3 EPR_CS/TR2 EPR_DO GPIO TEST PE Y RESET# V D VD U V D VD KEY VD R4 1M V D S1 C2 C3 C10 C4 47pF X1 12MHz C5 47pF C6 C7 C8 C9 KEY C11 RST# Y C12 C13 0. L1 3.3uH L2 Open/3.3uH R6 R7 27 ohm 27 ohm L3 L4 Short / 3.3uH Short / 3.3uH C17 20pF R5 1.5K C18 20pF C19 C R8 GND2-5V 10M HC1 HC4 8 HC2 HC3 USBGND CON1 MINI USB 5P C14 C15 C20 0. C21 4.7nF USBGND C22 C23 0. C24 0. C25 C26 0. C27 C28 0. All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 11

12 6.2 CSP Package (CS) R2 R1 1K 10k Y D1 R3 51k RST# KEY S1 C1 KEY C2 KEY GPO/TR0 EPR_EN IOTRAP# KEY# EPR_DI/TR1 EPR_SK/TR3 EPR_CS/TR2 EPR_DO Y CS V D VD U V D VD VD R4 1M C3 C4 X1 12MHz C5 C6 47pF 47pF GPIO TEST RESET# V C D C8 RST# C10 C9 C11 C12 Y C13 0. L1 3.3uH L2 Open/3.3uH R6 R7 27 ohm 27 ohm L3 L4 Short / 3.3uH Short / 3.3uH C17 20pF R5 1.5K C18 20pF C19 0. C R8 GND2-5V 10M HC1 HC4 8 HC2 HC3 USBGND CON1 MINI USB 5P C14 C15 C20 0. C21 4.7nF USBGND C22 C23 0. C24 0. C25 C26 0. C27 C28 0. All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 12

13 7. Update History Version Update Date V1.0 Creation, Preliminary 1 st version 10/27/2004 V Specifications 5. Package information 10/29/2004 V Specifications 5. Package information 11/04/2004 V Specifications 5. Package information 06/28/ Reference Application Circuit V Package information 6. Reference Application Circuit 07/01/2005 V1.5 General Description 5. Package information 6. Reference Application Circuit (Change list: C4, C5, L2) 10/07/2005 All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 13

PAC7312 VGA PC Camera Single-Chip with Audio

PAC7312 VGA PC Camera Single-Chip with Audio General Description The is a single chip with an embedded VGA CMOS image sensor and USB 1.1 interface. It has JPEG image compression and image processing. The generic application is a PC camera. JPEG decoder